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Fresh and Altered Clay

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estriz

Petroleum
Joined
Jun 17, 2010
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US
I am looking at some driller's logs from old (70s) well completion reports. They desrcibe layers of altered clay and also layers of fresh clay. Can someone explain what those descriptions mean?
 
Please, A little more information.
What part of the country/world is this from?
Is this a domestic type (potable)water well?
Was the driller a specialty-type? Water well, mineral exploration, etc???
Does the altered or fresh clay seem to describe alluvial sediments or rocks (formational units)?
 
The driller's log is a potable water well in the Lebo Member of the Ft Union formation in the Powder River Basin in Wyoming. It is an alluvial sandstone/siltstone deposit with coal seams. These descriptions are within the first 300 ft bgs. Thanks.
 
the driller can - sorry to be so glib. Driller's logs can be quite random. It'd be hard to guess, but the local drillers would be able to answer this question.

f-d

¡papá gordo ain’t no madre flaca!
 
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